CHICAGO — Michael Conforto will try to stay ready for whatever the Mets have in mind for him.

The second-year outfielder rejoined the team Monday, after completing a three-week stint at Triple-A Las Vegas designed to resurrect his swing. To that end, Conforto is happy with the .344 batting average with three homers and 15 RBIs he totaled in 16 games there.

“It was a very productive couple of weeks,” Conforto said before delivering a pinch-hit single in the ninth inning of the Mets’ 5-1 loss to the Cubs.

Where and how much Conforto will play is now the question.

Yoenis Cespedes, according to manager Terry Collins, will likely become the primary left fielder to reduce the mileage on his legs. That could leave Conforto mostly shifting between right (a position he just started learning at Las Vegas) and potentially — believe it or not — center.

Though Conforto is hardly blessed with great speed, and hasn’t played center field since college, Collins appears ready to give the experiment a shot.

Conforto began taking balls in center during pregame drills on Monday.

“We’ve got two veteran guys that I think can help [Conforto] if that’s where we decide he’s going to play,” Collins said, referring to Cespedes and Curtis Granderson. “We’ve got two guys that can certainly pick up and help him with the placement of where he’s positioning himself.”

Is Noah Syndergaard’s “dead” arm live again?

The Mets figure to receive their answer on Tuesday, when the stud righty is scheduled to face Jake Arrieta at Wrigley Field in a battle of aces.

Syndergaard was removed after 4 ²/₃ innings in his last start, on July 8 against the Nationals, because of fatigue. Collins cited “dead arm” as the issue.

“I think the rest has been good for him,” Collins said before Monday’s game. “We’ll see how he is after 75 pitches, to see if fatigue sets in. But I’m not worried about him when the game starts.”

Matt Harvey underwent surgery in St. Louis for thoracic outlet syndrome. The righty is expected back for spring training in 2017.

Jim Henderson is “getting there,” according to Collins, in his rehab assignment at Triple-A Las Vegas. The veteran reliever, who is recovering from shoulder tendinitis, has been throwing his fastball in the 91-93 mph range. Before he was placed on the DL last month, he was consistently in the 93-95 range.